Augustine of Hippo
Catena Aurea · Johannesevangelium 3
John answered and said, A man can receive nothing, except it be given him from heaven. Ye yourselves bear me witness, that I said, I am not the Christ, but that I am sent before him. He that hath the bride is the bridegroom; but the friend of the bridegroom, which standeth and heareth him, rejoiceth greatly because of the bridegroom’s voice: this my joy therefore is fulfilled. He must increase, but I must decrease.
(Tr. xiv. c. 3) Or thus; This my Joy is fulfilled, i. e. my joy at hearing the Bridegroom’s voice. I have my gift; I claim no more, lest I lose that which I have received. He who would rejoice in himself, hath sorrow; but he who would rejoice in the Lord, shall ever rejoice, because God is everlasting.